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<div class="title">tnt_stopwatch.h</div>  </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">/*</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment">*</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment">* Mathematical and Computational Sciences Division</span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment">* National Institute of Technology,</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment">* Gaithersburg, MD USA</span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment">*</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment">*</span></div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment">* This software was developed at the National Institute of Standards and</span></div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="comment">* Technology (NIST) by employees of the Federal Government in the course</span></div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="comment">* of their official duties. Pursuant to title 17 Section 105 of the</span></div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="comment">* United States Code, this software is not subject to copyright protection</span></div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="comment">* and is in the public domain.  NIST assumes no responsibility whatsoever for</span></div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="comment">* its use by other parties, and makes no guarantees, expressed or implied,</span></div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="comment">* about its quality, reliability, or any other characteristic.</span></div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="comment">*</span></div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="comment">*/</span></div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;</div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;</div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;</div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="preprocessor">#ifndef STOPWATCH_H</span></div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define STOPWATCH_H</span></div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="comment">// for clock() and CLOCKS_PER_SEC</span></div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="preprocessor">#include &lt;time.h&gt;</span></div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;</div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;</div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;<span class="keyword">namespace </span>TNT</div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;{</div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;</div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;<span class="keyword">inline</span> <span class="keyword">static</span> <span class="keywordtype">double</span> seconds(<span class="keywordtype">void</span>)</div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;{</div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;    <span class="keyword">const</span> <span class="keywordtype">double</span> secs_per_tick = 1.0 / CLOCKS_PER_SEC;</div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;    <span class="keywordflow">return</span> ( (<span class="keywordtype">double</span>) clock() ) * secs_per_tick;</div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;}</div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;</div>
<div class="line"><a name="l00036"></a><span class="lineno"><a class="code" href="class_t_n_t_1_1_stopwatch.html">   36</a></span>&#160;<span class="keyword">class </span><a class="code" href="class_t_n_t_1_1_stopwatch.html">Stopwatch</a> {</div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;    <span class="keyword">private</span>:</div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;        <span class="keywordtype">int</span> running_;</div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;        <span class="keywordtype">double</span> start_time_;</div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;        <span class="keywordtype">double</span> total_;</div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;</div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;    <span class="keyword">public</span>:</div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;        <span class="keyword">inline</span> <a class="code" href="class_t_n_t_1_1_stopwatch.html#a976a48f6c1cc30db1c1873fe1befd043">Stopwatch</a>();</div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;        <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="class_t_n_t_1_1_stopwatch.html#acffbfa774f877e9cc5c0ed9f76fcf97d">start</a>();</div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;        <span class="keyword">inline</span> <span class="keywordtype">double</span> <a class="code" href="class_t_n_t_1_1_stopwatch.html#a9212d1af18b726c3869fd3f720e75ea8">stop</a>();</div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;                <span class="keyword">inline</span> <span class="keywordtype">double</span> <a class="code" href="class_t_n_t_1_1_stopwatch.html#ad4d107c357a747472cf6c2a5065c984e">read</a>();</div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;                <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="class_t_n_t_1_1_stopwatch.html#a2eaa2b36d880c4ef6c6f7c57a11bea59">resume</a>();</div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;                <span class="keyword">inline</span> <span class="keywordtype">int</span> <a class="code" href="class_t_n_t_1_1_stopwatch.html#a4d508deee9b0ad0971f09dff0da98d51">running</a>();</div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;};</div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;</div>
<div class="line"><a name="l00051"></a><span class="lineno"><a class="code" href="class_t_n_t_1_1_stopwatch.html#a976a48f6c1cc30db1c1873fe1befd043">   51</a></span>&#160;<span class="keyword">inline</span> <a class="code" href="class_t_n_t_1_1_stopwatch.html#a976a48f6c1cc30db1c1873fe1befd043">Stopwatch::Stopwatch</a>() : running_(0), start_time_(0.0), total_(0.0) {}</div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;</div>
<div class="line"><a name="l00053"></a><span class="lineno"><a class="code" href="class_t_n_t_1_1_stopwatch.html#acffbfa774f877e9cc5c0ed9f76fcf97d">   53</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="class_t_n_t_1_1_stopwatch.html#acffbfa774f877e9cc5c0ed9f76fcf97d">Stopwatch::start</a>() </div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;{</div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;        running_ = 1;</div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;        total_ = 0.0;</div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;        start_time_ = seconds();</div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;}</div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;</div>
<div class="line"><a name="l00060"></a><span class="lineno"><a class="code" href="class_t_n_t_1_1_stopwatch.html#a9212d1af18b726c3869fd3f720e75ea8">   60</a></span>&#160;<span class="keywordtype">double</span> <a class="code" href="class_t_n_t_1_1_stopwatch.html#a9212d1af18b726c3869fd3f720e75ea8">Stopwatch::stop</a>()  </div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;{</div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;        <span class="keywordflow">if</span> (running_) </div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;        {</div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;         total_ += (seconds() - start_time_); </div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;         running_ = 0;</div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;    }</div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;    <span class="keywordflow">return</span> total_; </div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;}</div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;</div>
<div class="line"><a name="l00070"></a><span class="lineno"><a class="code" href="class_t_n_t_1_1_stopwatch.html#a2eaa2b36d880c4ef6c6f7c57a11bea59">   70</a></span>&#160;<span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="class_t_n_t_1_1_stopwatch.html#a2eaa2b36d880c4ef6c6f7c57a11bea59">Stopwatch::resume</a>()</div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;{</div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;        <span class="keywordflow">if</span> (!running_)</div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;        {</div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;                start_time_ = seconds();</div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;                running_ = 1;</div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;        }</div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;}</div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;                </div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;</div>
<div class="line"><a name="l00080"></a><span class="lineno"><a class="code" href="class_t_n_t_1_1_stopwatch.html#ad4d107c357a747472cf6c2a5065c984e">   80</a></span>&#160;<span class="keyword">inline</span> <span class="keywordtype">double</span> <a class="code" href="class_t_n_t_1_1_stopwatch.html#ad4d107c357a747472cf6c2a5065c984e">Stopwatch::read</a>()   </div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;{</div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;        <span class="keywordflow">if</span> (running_)</div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;        {</div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;                <a class="code" href="class_t_n_t_1_1_stopwatch.html#a9212d1af18b726c3869fd3f720e75ea8">stop</a>();</div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;                <a class="code" href="class_t_n_t_1_1_stopwatch.html#a2eaa2b36d880c4ef6c6f7c57a11bea59">resume</a>();</div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;        }</div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;        <span class="keywordflow">return</span> total_;</div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;}</div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;</div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;</div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;} <span class="comment">/* TNT namespace */</span></div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;<span class="preprocessor"></span>    </div>
<div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;</div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;            </div>
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